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1014 Semphyra

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Dec 15, 2021

1014 Semphyra, provisional designation 1924 PW, is a background asteroid from the central regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 29 January 1924, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[10] The asteroid was named after the character “Semphyra” in a poem by Aleksandr Pushkin.[2]

1014 Semphyra
Discovery[1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 29 January 1924
Designations
(1014) Semphyra
Named after
figure in poem
by Aleksandr Pushkin[2]
1924 PW · 1932 WH
1984 YP6
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 93.02 yr (33,975 days)
Aphelion 3.3624 AU
Perihelion 2.2443 AU
2.8034 AU
Eccentricity 0.1994
4.69 yr (1,714 days)
332.39°
0° 12m 36s / day
Inclination 2.2681°
251.71°
233.24°
Physical characteristics
Dimensions 14.89±3.58 km[4]
17.17±0.88 km[5]
17.487±0.250 km[6][7]
23.21 km (calculated)[3]
5.636±0.002h[8]
0.057 (assumed)[3]
0.083±0.013[6]
0.0835±0.0130[7]
0.087±0.009[5]
0.12±0.06[4]
SMASS = Xe[1] · P[7] · X[3]
11.90[1][3][4] · 12.04±0.15[9] · 12.10[5][7]

    . . . 1014 Semphyra . . .

    Semphyra has not been associated with any known asteroid family. It orbits the Sun in the central main belt at a distance of 2.2–3.4 AU once every 4 years and 8 months (1,714 days). Its orbit has an eccentricity of 0.20 and an inclination of 2° with respect to the ecliptic.[1]

    The body’s observation arc begins with its official discovery observation at Heidelberg.[10]

    In the SMASS classification, Semphyra is an Xe-subtype that transitions from the X-type to the bright E-type asteroids, while the Wide-field Infrared Survey Explorer characterizes it as a dark P-type.[1][3][7]

    In February 2004, a rotational lightcurve of Semphyra was obtained from photometric observations by American astronomer Donald Pray at the Carbuncle Hill Observatory, Rhode Island (I00). The observations were made at a low phase angle of 1.6–2.9°. Lightcurve analysis gave a well-defined rotation period of 5.636 hours with a brightness amplitude of 0.12 magnitude (U=3), indicating that the body has a rather spheroidal shape.[8]

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA’s WISE, Semphyra measures between 14.89 and 17.487 kilometers in diameter and its surface has an albedo between 0.083 and 0.12.[4][5][6][7]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 23.21 kilometers based on an absolute magnitude of 11.9.[3]

    . . . 1014 Semphyra . . .

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    . . . 1014 Semphyra . . .